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Linux/arch/frv/include/asm/pgalloc.h

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  1 /* pgalloc.h: Page allocation routines for FRV
  2  *
  3  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Howells (dhowells@redhat.com)
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the License, or (at your option) any later version.
 10  *
 11  * Derived from:
 12  *      include/asm-m68knommu/pgalloc.h
 13  *      include/asm-i386/pgalloc.h
 14  */
 15 #ifndef _ASM_PGALLOC_H
 16 #define _ASM_PGALLOC_H
 17 
 18 #include <asm/setup.h>
 19 #include <asm/virtconvert.h>
 20 
 21 #ifdef CONFIG_MMU
 22 
 23 #define pmd_populate_kernel(mm, pmd, pte) __set_pmd(pmd, __pa(pte) | _PAGE_TABLE)
 24 #define pmd_populate(MM, PMD, PAGE)                                             \
 25 do {                                                                            \
 26         __set_pmd((PMD), page_to_pfn(PAGE) << PAGE_SHIFT | _PAGE_TABLE);        \
 27 } while(0)
 28 #define pmd_pgtable(pmd) pmd_page(pmd)
 29 
 30 /*
 31  * Allocate and free page tables.
 32  */
 33 
 34 extern pgd_t *pgd_alloc(struct mm_struct *);
 35 extern void pgd_free(struct mm_struct *mm, pgd_t *);
 36 
 37 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
 38 
 39 extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
 40 
 41 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 42 {
 43         free_page((unsigned long)pte);
 44 }
 45 
 46 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
 47 {
 48         pgtable_page_dtor(pte);
 49         __free_page(pte);
 50 }
 51 
 52 #define __pte_free_tlb(tlb,pte,address)                 \
 53 do {                                                    \
 54         pgtable_page_dtor(pte);                         \
 55         tlb_remove_page((tlb),(pte));                   \
 56 } while (0)
 57 
 58 /*
 59  * allocating and freeing a pmd is trivial: the 1-entry pmd is
 60  * inside the pgd, so has no extra memory associated with it.
 61  * (In the PAE case we free the pmds as part of the pgd.)
 62  */
 63 #define pmd_alloc_one(mm, addr)         ({ BUG(); ((pmd_t *) 2); })
 64 #define pmd_free(mm, x)                 do { } while (0)
 65 #define __pmd_free_tlb(tlb,x,a)         do { } while (0)
 66 
 67 #endif /* CONFIG_MMU */
 68 
 69 #endif /* _ASM_PGALLOC_H */
 70 

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